This 15 amp SPST (single pole, single throw) switch has an internal spring that returns the switch to the off position. It is ideal for a starter switch or any other momentary switching function. This switch is custom-made with a special "Reverse Keyway" so that it will work properly with our Military Switch Guard (Part No. 4429). Switch contacts are made of solid, fine silver for highest reliability. Toggle switches feature nickel plated, 11/16 inch long actuators. The mounting bushing diameter and bushing length are both 15/32 inch. Mounting hardware is furnished. Connection is by solder-lug terminals. We also offer a SPST Momentary-On Switch with Push-On Terminals (part #4417) for easier hookup.